import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
public class MainClass {
public static void main(String[] argv) throws Exception {
String filename = "test.dat";
RandomAccessFile raf1 = new RandomAccessFile(filename, "rw");
FileChannel fc1 = raf1.getChannel();
RandomAccessFile raf2 = new RandomAccessFile(filename, "rw");
FileChannel fc2 = raf2.getChannel();
System.out.println("Grabbing first lock");
FileLock lock1 = fc1.lock(0L, Integer.MAX_VALUE, false);
System.out.println("Grabbing second lock");
FileLock lock2 = fc2.lock(5, 10, false);
System.out.println("Exiting");
}
}